Tokyo in the near future.
NOUNAI Senri joins the large pharmaceutical company RUOWA in order to cure his older sister Mari's incurable disease. However, at the company he takes RUOWA Metal, a drink that turns muscles into metal, and his body becomes weak due to the side effects.
Senri's body was getting weaker and weaker, but he tried to protect Ellie, the daughter of TAKAYAMA Eiki, the last survivor of that medicine.